[go]日志库小例子

输出日志

//输出日志到console
msg := fmt.Sprintf(format, args...) //format里的坑  args解出的数据相匹配
fmt.Fprintf(os.Stdout, "%s\n", msg)


//输出日志到文件
file, _ := os.OpenFile("/tmp/test.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
fmt.Fprintf(file, "name: %s\n", "maotai")

异步写日志

//将日志写入chan
select {
case f.LogDataChan <- logData:
default:
}

//从chan中去除日志写到文件
for logData := range f.LogDataChan {
    fmt.Fprintf(file, "%s %s (%s:%s:%d) %s\n", logData.TimeStr, logData.LevelStr, logData.Filename, logData.FuncName, logData.LineNo, logData.Message)
}

//写日志核心逻辑

func main() {
    ch := make(chan int, 10)
    //异步写日志

    //读日志
    go func() {
        for v := range ch {
            fmt.Println(v)
        }
    }()

    for {//防止子协程退出
        select {
        case ch <- 1:
        default: //管道满了则丢弃日志,防止程序夯住
        }
        time.Sleep(time.Second)
    }
}